JPH11186952A - Power supply for portable telephone set - Google Patents
Power supply for portable telephone setInfo
- Publication number
- JPH11186952A JPH11186952A JP9353130A JP35313097A JPH11186952A JP H11186952 A JPH11186952 A JP H11186952A JP 9353130 A JP9353130 A JP 9353130A JP 35313097 A JP35313097 A JP 35313097A JP H11186952 A JPH11186952 A JP H11186952A
- Authority
- JP
- Japan
- Prior art keywords
- power supply
- circuit
- state
- voltage
- switching power
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Landscapes
- Direct Current Feeding And Distribution (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Transceivers (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、効率の良い携帯電
話機用電源装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an efficient power supply for a portable telephone.
【０００２】[0002]
【従来の技術】従来のこの種の電源装置は、例えば特公
平５―９１６６０号公報に記載されたものが知られてい
る。図５において、１は電池等の主電源、２は電源切替
装置、３は無線回路等の負荷である。電源切替装置２
は、電力検出部４、複数の副電源Ａ，Ｂ，…，Ｎ、電源
切替スイッチ５及び電源切替制御部６からなっている。
電源切替装置２は、負荷３の消費電力に応じて、電源切
替制御部６の制御により電源切替スイッチ５を操作して
副電源Ａ，Ｂ，…，Ｎを切り替え、最も効率のよい電源
電圧を選ぶようにしている。2. Description of the Related Art A conventional power supply of this type is known, for example, from Japanese Patent Publication No. Hei 5-91660. In FIG. 5, 1 is a main power supply such as a battery, 2 is a power supply switching device, and 3 is a load such as a wireless circuit. Power supply switching device 2
Comprises a power detection unit 4, a plurality of sub-power supplies A, B,..., N, a power switch 5 and a power switch control unit 6.
The power supply switching device 2 operates the power supply switch 5 under the control of the power supply switching control unit 6 according to the power consumption of the load 3 to switch the sub-power supplies A, B,... I have to choose.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、上記従
来の電源装置は、負荷の消費電力に応じて、副電源を切
り替えるため、副電源を複数個持ち、又、電力検出部も
設置しなければならないという問題を有していた。However, the above-described conventional power supply device has a plurality of sub-power supplies and a power detection unit to switch the sub-power supply in accordance with the power consumption of the load. Had the problem that
【０００４】本発明は、上記従来の問題点を解決するも
ので、電力検出部を持たずに、携帯電話機の待ち受け／
通話の各状態や負荷に流れる電流量に応じて電源回路を
制御し、効率のよい、優れた携帯電話機用電源装置を提
供することを目的とする。SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems.
An object of the present invention is to provide an efficient and excellent power supply device for a mobile phone by controlling a power supply circuit according to each state of a call and an amount of current flowing to a load.
【０００５】[0005]
【課題を解決するための手段】上記目的を達成するため
に、本発明の携帯電話機用電源装置は、主電源としての
電池に接続されたスイッチング電源回路と、前記スイッ
チング電源回路の出力を受けて所要の電圧を出力し、負
荷回路へ供給する電圧レギュレータ回路と、前記スイッ
チング電源回路および負荷回路を制御する制御回路とを
備え、前記制御回路は、携帯電話機の待ち受け／通話の
各状態に応じて前記スイッチング電源回路の出力電圧を
制御することを特徴とするものである。In order to achieve the above object, a power supply device for a portable telephone according to the present invention receives a switching power supply circuit connected to a battery as a main power supply and an output of the switching power supply circuit. A voltage regulator circuit that outputs a required voltage and supplies the voltage to a load circuit; and a control circuit that controls the switching power supply circuit and the load circuit. The output voltage of the switching power supply circuit is controlled.
【０００６】また、携帯電話機の待ち受け／通話の各状
態の代りに、負荷回路に流れる電流量に応じてスイッチ
ング電源回路の出力電圧を制御するようにしてもよい。The output voltage of the switching power supply circuit may be controlled in accordance with the amount of current flowing through the load circuit instead of the standby / call state of the portable telephone.
【０００７】一般に、携帯電話機が通話中の時は、負荷
回路に最大電流が流れ、待ち受け中は電流が少ない。そ
こで、上記構成によれば、携帯電話機が通話状態にな
り、負荷電流が多くなると、電圧レギュレータ回路の出
力電圧がドロップするが、制御回路はスイッチング電源
回路を制御して、電圧レギュレータ回路に供給される電
圧を上げるようにするので、常に適正な電圧が負荷回路
へ供給されるようになる。In general, the maximum current flows through the load circuit when the portable telephone is talking, and the current is small during standby. Therefore, according to the above configuration, when the mobile phone enters a talking state and the load current increases, the output voltage of the voltage regulator circuit drops, but the control circuit controls the switching power supply circuit and supplies the voltage to the voltage regulator circuit. Thus, a proper voltage is always supplied to the load circuit.
【０００８】また、携帯電話機が待ち受け状態になった
時は、負荷回路へ流れる電流が少なくなり、電圧レギュ
レータ回路のドロップ電圧も少なくなるため、この時
は、電圧レギュレータ回路への供給電圧を下げるように
スイッチング電源回路を制御するので、電圧レギュレー
タ回路のロスを抑制し、電池の消耗を低減することがで
きる。Further, when the portable telephone enters a standby state, the current flowing to the load circuit decreases and the drop voltage of the voltage regulator circuit also decreases. In this case, the supply voltage to the voltage regulator circuit is reduced. Since the switching power supply circuit is controlled at the same time, loss of the voltage regulator circuit can be suppressed, and battery consumption can be reduced.
【０００９】また、前記構成において、電池とスイッチ
ング電源回路との間に、フィルター回路を設けることに
より、スイッチング電源回路の反射リップルを抑制し、
スイッチングノイズの漏れを防止することができる。Further, in the above configuration, by providing a filter circuit between the battery and the switching power supply circuit, reflection ripple of the switching power supply circuit is suppressed,
Leakage of switching noise can be prevented.
【００１０】さらに、制御回路は、携帯電話機が待ち受
け状態から通話状態へ、または負荷回路に流れる電流量
が少ない状態から多い状態へ移行する場合は、状態遷移
前に、携帯電話機が通話状態から待ち受け状態へ、また
は負荷回路に流れる電流量が多い状態から少ない状態へ
移行する場合は、状態遷移後に、それぞれスイッチング
電源回路の出力電圧を変化させるように制御する。この
制御により、制御電圧切替えによる、電圧レギュレータ
の応答性や電圧ドロップに影響されずに、常に安定した
電圧を負荷回路に供給することができる。Further, when the mobile phone shifts from a standby state to a talking state or from a state in which the amount of current flowing through the load circuit is small to a large state, the mobile phone waits from the talking state before the state transition. In the case of transition to a state or a state in which the amount of current flowing through the load circuit is large to small, after the state transition, control is performed so as to change the output voltage of the switching power supply circuit. With this control, a stable voltage can always be supplied to the load circuit without being affected by the response and the voltage drop of the voltage regulator due to the control voltage switching.
【００１１】[0011]
【発明の実施の形態】以下、本発明の実施の形態につい
て、図面を参照しながら詳細に説明する。Embodiments of the present invention will be described below in detail with reference to the drawings.
【００１２】（実施の形態１）図１は、本発明の実施の
形態１における携帯電話機用電源装置の構成をブロック
図で示したものである。図１において、１２は主電源と
しての電池１５に接続されたスイッチング電源回路、１
３はスイッチング電源回路１２の出力を受け、各負荷回
路へ適正な電圧を供給する電圧レギュレータ回路、１１
はスイッチング電源回路１２および負荷回路としての無
線回路１４を制御する制御回路である。制御回路１１
は、携帯電話機の待ち受け／通話の各状態に応じてスイ
ッチング電源回路１２の出力電圧を制御する。(Embodiment 1) FIG. 1 is a block diagram showing a configuration of a power supply device for a portable telephone according to Embodiment 1 of the present invention. In FIG. 1, reference numeral 12 denotes a switching power supply circuit connected to a battery 15 as a main power supply;
Reference numeral 3 denotes a voltage regulator circuit which receives an output of the switching power supply circuit 12 and supplies an appropriate voltage to each load circuit.
Is a control circuit for controlling the switching power supply circuit 12 and the wireless circuit 14 as a load circuit. Control circuit 11
Controls the output voltage of the switching power supply circuit 12 according to each of the standby / call states of the mobile phone.
【００１３】以上のように構成された本実施の形態にお
ける動作ついて、図３のフローチャートを参照して説明
する。The operation of the present embodiment configured as described above will be described with reference to the flowchart of FIG.
【００１４】まず、（ＳＴＥＰ１）電話機は、電池が装
着され、電話機の電源が入る。その後、制御回路１１は
ＲＥＳＥＴ ＳＴＡＲＴし、制御回路のイニシャル処理
終了後、電話機はアイドル状態に入る。First, (STEP 1) a battery is installed in a telephone, and the power of the telephone is turned on. Thereafter, the control circuit 11 performs RESET START, and after the initial processing of the control circuit is completed, the telephone enters an idle state.
【００１５】（ＳＴＥＰ２）制御回路１１は、ＲＥＳＥ
Ｔ ＳＴＡＲＴ後、ソフト制御により、予め格納されて
いる制御値をスイッチング電源回路１２に設定すること
で、負荷回路に対してある一定の電圧を供給し、待ち受
け状態に入る。(STEP 2) The control circuit 11 outputs
After T START, by setting a control value stored in advance in the switching power supply circuit 12 by software control, a certain voltage is supplied to the load circuit, and a standby state is entered.
【００１６】（ＳＴＥＰ３）制御回路１１は、電話機の
状態で、制御パターンの設定値変更の有無を判断する。
ＹＥＳであればＳＴＥＰ４へ進むが、ＮＯの場合は、現
状の電話機状態を維持するため、制御パターンの設定値
変更処理はＳＴＯＰする。(STEP 3) The control circuit 11 determines whether or not the set value of the control pattern has changed in the state of the telephone.
If YES, the process proceeds to STEP 4, but if NO, the control pattern set value changing process is stopped in order to maintain the current telephone state.
【００１７】ここで、図４に示したように、電話機が通
話の状態に入る時は、負荷回路には最大の電流が流れる
ため、スイッチング電源回路１２の出力電圧が高くなる
ように設定する。そうすることで、負荷回路に供給され
る電圧は、電圧レギュレータ回路１３の電圧ドロップが
大きくなっても、適正な電圧が、各負荷回路へ供給され
ることになる。Here, as shown in FIG. 4, when the telephone enters a talking state, the maximum current flows through the load circuit, so that the output voltage of the switching power supply circuit 12 is set to be high. By doing so, an appropriate voltage is supplied to each load circuit even if the voltage drop of the voltage regulator circuit 13 becomes large.
【００１８】一方、電話機が待ち受け状態になった時
は、負荷回路に流れる電流が下がるため、電圧レギュレ
ータ回路１３のドロップ電圧も少なくなる。そこで、制
御回路１１は、電圧レギュレータ回路１３のロスを押さ
えるため、電圧レギュレータ回路１３への供給電圧を下
げ、その結果として、電池１５の消耗を低減するように
する。通話中と同様に、制御回路１１は負荷電流を識別
し、適正な電圧をスイッチング電源回路１２に設定す
る。On the other hand, when the telephone is in the standby state, the current flowing through the load circuit decreases, so that the drop voltage of the voltage regulator circuit 13 also decreases. Therefore, the control circuit 11 reduces the supply voltage to the voltage regulator circuit 13 in order to suppress the loss of the voltage regulator circuit 13, and as a result, reduces the consumption of the battery 15. As during a call, the control circuit 11 identifies the load current and sets an appropriate voltage in the switching power supply circuit 12.
【００１９】（ＳＴＥＰ４）したがって、制御回路１１
から、電源の制御パターンの設定値を現状の電圧より低
い電圧に設定するのであれば、ＹＥＳのＳＴＥＰ５に進
み、電源の制御パターンの設定値を現状電圧より高い電
圧に設定するのであれば、ＮＯに進む。(STEP 4) Therefore, the control circuit 11
Then, if the set value of the power supply control pattern is set to a voltage lower than the current voltage, the process proceeds to STEP 5 of YES, and if the set value of the power supply control pattern is set to a voltage higher than the current voltage, NO Proceed to.
【００２０】（ＳＴＥＰ５）制御回路１１から、電源の
制御パターンの設定値を現状電圧より低い電圧に設定す
る場合は、制御パターンの更新は、通話中から待ち受け
中への状態遷移後（図４のポイント）にスイッチング
電圧の設定値を変更する。逆に、電源の制御パターンの
設定値を現状電圧より高い電圧に設定するのであれば、
状態遷移前（図４のポイント）にスイッチング電圧の
設定値を変更し、その後、状態を変更する。(STEP 5) When the control circuit 11 sets the set value of the control pattern of the power supply to a voltage lower than the current voltage, the control pattern is updated after the state transition from talking to waiting (see FIG. 4). Change the set value of the switching voltage to (point). Conversely, if the set value of the power supply control pattern is set to a voltage higher than the current voltage,
The set value of the switching voltage is changed before the state transition (point in FIG. 4), and then the state is changed.
【００２１】（ＳＴＥＰ６）スイッチング電源回路１２
は、制御値の変更により出力電圧を可変させる。出力電
圧変化後は、制御回路１１は電話機の状態を常に監視
し、次の制御パターンの変更の有無を検出するためＳＴ
ＥＰ３へ戻る。電話機の稼動状態により、スイッチング
電源の出力電圧を可変する場合は、電話機の待ち受け／
通話の各状態を制御回路１１が常に認識し、その状態に
応じてスイッチング電源回路１２の出力電圧を設定す
る。(STEP 6) Switching power supply circuit 12
Changes the output voltage by changing the control value. After the output voltage changes, the control circuit 11 constantly monitors the state of the telephone, and determines whether or not the next control pattern has been changed.
Return to EP3. If the output voltage of the switching power supply is varied depending on the operating state of the telephone,
The control circuit 11 always recognizes each state of the call, and sets the output voltage of the switching power supply circuit 12 according to the state.
【００２２】以上のように、本発明の実施の形態によれ
ば、電話機が通話中か待機中かに応じて、あるいは負荷
回路に流れる電流量の大小に応じて、制御回路１１がス
イッチング電源回路１２を制御し、電圧レギュレータ回
路１３に印加する電圧を変えることにより、各負荷回路
へ適切な電圧を供給することができ、あるいは電圧レギ
ュレータ回路のロスを押さえて、電池の消耗を低減する
ことができる。As described above, according to the embodiment of the present invention, the control circuit 11 controls the switching power supply circuit in accordance with whether the telephone is in a call or in a standby state, or in accordance with the amount of current flowing through the load circuit. By controlling the voltage regulator 12 and changing the voltage applied to the voltage regulator circuit 13, an appropriate voltage can be supplied to each load circuit, or the loss of the battery can be reduced by suppressing the loss of the voltage regulator circuit. it can.
【００２３】そして、本実施の形態における構成と従来
の電源切り替え方式の構成とを比較して明らかなよう
に、本発明は、従来構成のように複数個の副電源や電力
検出回路を必要とせずに、１組の電源で構成できるた
め、装置の小型化の点で優れた効果が得られる。As is apparent from a comparison between the configuration of the present embodiment and the configuration of the conventional power supply switching system, the present invention requires a plurality of sub-power supplies and a power detection circuit as in the conventional configuration. Instead, it can be composed of one set of power supplies, so that an excellent effect can be obtained in terms of miniaturization of the device.
【００２４】（実施の形態２）図２は、本発明の実施の
形態２における携帯電話機用電源装置の構成をブロック
図で示したものである。図２において、図１と同一の構
成要素には同一符号を付してあり、また、１６は、電池
１５とスイッチング電源回路１２との間に挿入した、ス
イッチング電源のスイッチングノイズを抑制するための
フィルター回路である。(Embodiment 2) FIG. 2 is a block diagram showing a configuration of a power supply device for a portable telephone according to Embodiment 2 of the present invention. 2, the same components as those in FIG. 1 are denoted by the same reference numerals, and reference numeral 16 denotes a component inserted between the battery 15 and the switching power supply circuit 12 for suppressing switching noise of the switching power supply. It is a filter circuit.
【００２５】このように構成された本実施の形態２で
は、スイッチング電源回路１２から電池１５側へのノイ
ズ漏れを防止することができる。In the second embodiment configured as described above, noise leakage from the switching power supply circuit 12 to the battery 15 can be prevented.
【００２６】[0026]
【発明の効果】以上説明したように、本発明によれば、
電話機の待ち受け状態／通話状態に応じ、あるいは負荷
回路に流れる電流値に応じてスイッチング電源回路を制
御し、電圧レギュレータ回路の入力電圧を可変すること
で、負荷回路に対して常に適正な電圧を供給することが
できるとともに、電圧レギュレータ回路のロスを押さえ
て電池の消耗を低減することができるという効果が得ら
れる。As described above, according to the present invention,
Controls the switching power supply circuit according to the standby state / talking state of the telephone or the current value flowing to the load circuit, and varies the input voltage of the voltage regulator circuit to always supply an appropriate voltage to the load circuit. In addition to this, there is an effect that the loss of the battery can be reduced by suppressing the loss of the voltage regulator circuit.
【図１】本発明の実施の形態１における携帯電話機用電
源装置のブロック図FIG. 1 is a block diagram of a power supply device for a mobile phone according to a first embodiment of the present invention.
【図２】本発明の実施の形態２における携帯電話機用電
源装置のブロック図FIG. 2 is a block diagram of a power supply device for a mobile phone according to a second embodiment of the present invention.
【図３】本発明の実施の形態１における動作フローチャ
ートFIG. 3 is an operation flowchart according to the first embodiment of the present invention.
【図４】電源制御タイミング図FIG. 4 is a power supply control timing chart.
【図５】従来の電源切り替え方式の携帯電話機用電源装
置のブロック図FIG. 5 is a block diagram of a conventional power supply device for a portable telephone of a power supply switching type.
１１ 制御回路 １２ スイッチング電源回路 １３ 電圧レギュレータ回路 １４ 無線回路 １５ 電池 １６ フィルター回路 Reference Signs List 11 control circuit 12 switching power supply circuit 13 voltage regulator circuit 14 wireless circuit 15 battery 16 filter circuit
Claims (5)
チング電源回路と、前記スイッチング電源回路の出力を
受けて所要の電圧を出力し、負荷回路へ供給する電圧レ
ギュレータ回路と、前記スイッチング電源回路および負
荷回路を制御する制御回路とを備え、前記制御回路は、
携帯電話機の待ち受け／通話の各状態に応じて前記スイ
ッチング電源回路の出力電圧を制御することを特徴とす
る携帯電話機用電源装置。A switching power supply circuit connected to a battery serving as a main power supply; a voltage regulator circuit receiving an output of the switching power supply circuit, outputting a required voltage, and supplying the output voltage to a load circuit; A control circuit for controlling a load circuit, wherein the control circuit comprises:
A power supply device for a mobile phone, wherein the output voltage of the switching power supply circuit is controlled in accordance with each of a standby state and a call state of the mobile phone.
スイッチング電源のスイッチングノイズを抑制するため
のフィルター回路を有することを特徴とする請求項１記
載の携帯電話機用電源装置。2. Between a battery and a switching power supply circuit,
The power supply device for a portable telephone according to claim 1, further comprising a filter circuit for suppressing switching noise of the switching power supply.
チング電源回路と、前記スイッチング電源回路の出力を
受けて所要の電圧を出力し、負荷回路へ供給する電圧レ
ギュレータ回路と、前記スイッチング電源回路および負
荷回路を制御する制御回路とを備え、前記制御回路は、
負荷回路に流れる電流量に応じて前記スイッチング電源
回路の出力電圧を制御することを特徴とする携帯電話機
用電源装置。3. A switching power supply circuit connected to a battery as a main power supply, a voltage regulator circuit receiving an output of the switching power supply circuit, outputting a required voltage, and supplying the output voltage to a load circuit; A control circuit for controlling a load circuit, wherein the control circuit comprises:
A power supply device for a mobile phone, wherein an output voltage of the switching power supply circuit is controlled according to an amount of current flowing in a load circuit.
スイッチング電源のスイッチングノイズを抑制するため
のフィルター回路を有することを特徴とする請求項３記
載の携帯電話機用電源装置。4. Between a battery and a switching power supply circuit,
The power supply device for a portable telephone according to claim 3, further comprising a filter circuit for suppressing switching noise of the switching power supply.
から通話状態へ、または負荷回路に流れる電流量が少な
い状態から多い状態へ移行する場合は、状態遷移前に、
携帯電話機が通話状態から待ち受け状態へ、または負荷
回路に流れる電流量が多い状態から少ない状態へ移行す
る場合は、状態遷移後に、それぞれスイッチング電源回
路の出力電圧を変化させるように制御することを特徴と
する請求項１から請求項４までのいずれか１項に記載の
携帯電話機用電源装置。5. The control circuit, when the mobile phone shifts from a standby state to a call state or from a state where the amount of current flowing through the load circuit is small to a large state, before the state transition.
When the mobile phone shifts from the talk state to the standby state or from the state where the amount of current flowing through the load circuit is large to the state where it is small, after the state transition, control is performed so as to change the output voltage of the switching power supply circuit. The power supply for a mobile phone according to any one of claims 1 to 4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9353130A JPH11186952A (en) | 1997-12-22 | 1997-12-22 | Power supply for portable telephone set |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9353130A JPH11186952A (en) | 1997-12-22 | 1997-12-22 | Power supply for portable telephone set |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH11186952A true JPH11186952A (en) | 1999-07-09 |
Family
ID=18428771
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9353130A Pending JPH11186952A (en) | 1997-12-22 | 1997-12-22 | Power supply for portable telephone set |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH11186952A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004112730A (en) * | 2002-06-11 | 2004-04-08 | Tai-Her Yang | Wireless information device |
| WO2005046054A1 (en) * | 2003-11-11 | 2005-05-19 | Fujitsu Limited | Semiconductor device, radio terminal and radio communication unit |
| KR100710332B1 (en) * | 2005-06-28 | 2007-04-23 | 엘지전자 주식회사 | Terminal for DMB |
| CN100362724C (en) * | 2005-04-15 | 2008-01-16 | 金宝电子工业股份有限公司 | Apparatus and method for multi function products effectively utilizing battery electricity quantity |
| JP2008113482A (en) * | 2006-10-30 | 2008-05-15 | Hitachi Kokusai Electric Inc | Charger for portable terminal |
| JP2008113504A (en) * | 2006-10-30 | 2008-05-15 | Kyocera Corp | Electronic device and power supply circuit |
-
1997
- 1997-12-22 JP JP9353130A patent/JPH11186952A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004112730A (en) * | 2002-06-11 | 2004-04-08 | Tai-Her Yang | Wireless information device |
| WO2005046054A1 (en) * | 2003-11-11 | 2005-05-19 | Fujitsu Limited | Semiconductor device, radio terminal and radio communication unit |
| US7684780B2 (en) | 2003-11-11 | 2010-03-23 | Fujitsu Microelectronics Limited | Semiconductor device, radio terminal device, and radio communication equipment |
| CN100362724C (en) * | 2005-04-15 | 2008-01-16 | 金宝电子工业股份有限公司 | Apparatus and method for multi function products effectively utilizing battery electricity quantity |
| KR100710332B1 (en) * | 2005-06-28 | 2007-04-23 | 엘지전자 주식회사 | Terminal for DMB |
| JP2008113482A (en) * | 2006-10-30 | 2008-05-15 | Hitachi Kokusai Electric Inc | Charger for portable terminal |
| JP2008113504A (en) * | 2006-10-30 | 2008-05-15 | Kyocera Corp | Electronic device and power supply circuit |
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